exam Maths Puzzle Numerical Ability

Solve the folling 2 x 2 systems using substitutions

y= 3x + 12
y= -x +4

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exam Other Question

can anyone help me on this problem? im a bit confused on this.

A retailer buys mushrooms for $2/kg and sells them for $5/kg.
Mushrooms not sold on the first day are returned to Using coordinate geometry, prove the the diagonals of a rhombus are perpendicular.